Rovibrational matrix elements of multipole moments of the HD,HT and DT molecules

Rovibrational matrix elements of the multipole moments Q _? of HD, HT and DT for ranks 2 ≤ ? ≤ 11 have been computed. Since the present calculations have been performed with the nuclear centre of mass (rather than the geometric centre) as the origin, the computations had to include even as well as odd values of ?. The results are used to correlate the absorption intensities of the zero-phonon single transitions in solid HD to theory.